201568001 has 4 divisors (see below), whose sum is σ = 203832900. Its totient is φ = 199303104.

The previous prime is 201567953. The next prime is 201568019. The reversal of 201568001 is 100865102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81884401 + 119683600 = 9049^2 + 10940^2 .

It is a cyclic number.

It is not a de Polignac number, because 201568001 - 2²² = 197373697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201568051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1132316 + ... + 1132493.

It is an arithmetic number, because the mean of its divisors is an integer number (50958225).

Almost surely, 2^201568001 is an apocalyptic number.

It is an amenable number.

201568001 is a deficient number, since it is larger than the sum of its proper divisors (2264899).

201568001 is an equidigital number, since it uses as much as digits as its factorization.

201568001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264898.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 201568001 is about 14197.4645975963. The cubic root of 201568001 is about 586.3278585997.

The spelling of 201568001 in words is "two hundred one million, five hundred sixty-eight thousand, one".